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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
835c34a1 | 3 | * prepare to run common code |
1da177e4 LT |
4 | * |
5 | * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE | |
1da177e4 LT |
6 | */ |
7 | ||
be3606ff | 8 | #define DISABLE_BRANCH_PROFILING |
1da177e4 LT |
9 | #include <linux/init.h> |
10 | #include <linux/linkage.h> | |
11 | #include <linux/types.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/percpu.h> | |
eaf76e8b | 15 | #include <linux/start_kernel.h> |
8b664aa6 | 16 | #include <linux/io.h> |
72d7c3b3 | 17 | #include <linux/memblock.h> |
5868f365 | 18 | #include <linux/mem_encrypt.h> |
1da177e4 LT |
19 | |
20 | #include <asm/processor.h> | |
21 | #include <asm/proto.h> | |
22 | #include <asm/smp.h> | |
1da177e4 LT |
23 | #include <asm/setup.h> |
24 | #include <asm/desc.h> | |
f6c2e333 | 25 | #include <asm/pgtable.h> |
cfd243d4 | 26 | #include <asm/tlbflush.h> |
2bc0414e | 27 | #include <asm/sections.h> |
718fc13b | 28 | #include <asm/kdebug.h> |
66441bd3 | 29 | #include <asm/e820/api.h> |
47a3d5da | 30 | #include <asm/bios_ebda.h> |
5dcd14ec | 31 | #include <asm/bootparam_utils.h> |
feddc9de | 32 | #include <asm/microcode.h> |
ef7f0d6a | 33 | #include <asm/kasan.h> |
1da177e4 | 34 | |
8170e6be PA |
35 | /* |
36 | * Manage page tables very early on. | |
37 | */ | |
8170e6be | 38 | extern pmd_t early_dynamic_pgts[EARLY_DYNAMIC_PAGE_TABLES][PTRS_PER_PMD]; |
c88d7150 | 39 | static unsigned int __initdata next_early_pgt; |
5e427ec2 | 40 | pmdval_t early_pmd_flags = __PAGE_KERNEL_LARGE & ~(_PAGE_GLOBAL | _PAGE_NX); |
8170e6be | 41 | |
e626e6bb | 42 | #ifdef CONFIG_X86_5LEVEL |
4c2b4058 | 43 | unsigned int pgtable_l5_enabled __ro_after_init; |
e626e6bb | 44 | EXPORT_SYMBOL(pgtable_l5_enabled); |
b16e770b | 45 | unsigned int pgdir_shift __ro_after_init = 39; |
c65e774f | 46 | EXPORT_SYMBOL(pgdir_shift); |
b16e770b | 47 | unsigned int ptrs_per_p4d __ro_after_init = 1; |
c65e774f | 48 | EXPORT_SYMBOL(ptrs_per_p4d); |
e626e6bb KS |
49 | #endif |
50 | ||
eedb92ab | 51 | #ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT |
4fa5662b | 52 | unsigned long page_offset_base __ro_after_init = __PAGE_OFFSET_BASE_L4; |
eedb92ab | 53 | EXPORT_SYMBOL(page_offset_base); |
a7412546 | 54 | unsigned long vmalloc_base __ro_after_init = __VMALLOC_BASE_L4; |
eedb92ab | 55 | EXPORT_SYMBOL(vmalloc_base); |
9b46a051 | 56 | unsigned long vmemmap_base __ro_after_init = __VMEMMAP_BASE_L4; |
eedb92ab KS |
57 | EXPORT_SYMBOL(vmemmap_base); |
58 | #endif | |
59 | ||
26179670 KS |
60 | #define __head __section(.head.text) |
61 | ||
62 | static void __head *fixup_pointer(void *ptr, unsigned long physaddr) | |
c88d7150 KS |
63 | { |
64 | return ptr - (void *)_text + (void *)physaddr; | |
65 | } | |
66 | ||
4fa5662b KS |
67 | static unsigned long __head *fixup_long(void *ptr, unsigned long physaddr) |
68 | { | |
69 | return fixup_pointer(ptr, physaddr); | |
70 | } | |
71 | ||
4c2b4058 KS |
72 | #ifdef CONFIG_X86_5LEVEL |
73 | static unsigned int __head *fixup_int(void *ptr, unsigned long physaddr) | |
74 | { | |
75 | return fixup_pointer(ptr, physaddr); | |
76 | } | |
77 | ||
6f9dd329 | 78 | static bool __head check_la57_support(unsigned long physaddr) |
4c2b4058 KS |
79 | { |
80 | if (native_cpuid_eax(0) < 7) | |
6f9dd329 | 81 | return false; |
4c2b4058 KS |
82 | |
83 | if (!(native_cpuid_ecx(7) & (1 << (X86_FEATURE_LA57 & 31)))) | |
6f9dd329 | 84 | return false; |
4c2b4058 KS |
85 | |
86 | *fixup_int(&pgtable_l5_enabled, physaddr) = 1; | |
b16e770b KS |
87 | *fixup_int(&pgdir_shift, physaddr) = 48; |
88 | *fixup_int(&ptrs_per_p4d, physaddr) = 512; | |
4fa5662b | 89 | *fixup_long(&page_offset_base, physaddr) = __PAGE_OFFSET_BASE_L5; |
a7412546 | 90 | *fixup_long(&vmalloc_base, physaddr) = __VMALLOC_BASE_L5; |
9b46a051 | 91 | *fixup_long(&vmemmap_base, physaddr) = __VMEMMAP_BASE_L5; |
6f9dd329 KS |
92 | |
93 | return true; | |
4c2b4058 KS |
94 | } |
95 | #else | |
6f9dd329 KS |
96 | static bool __head check_la57_support(unsigned long physaddr) |
97 | { | |
98 | return false; | |
99 | } | |
4c2b4058 KS |
100 | #endif |
101 | ||
aca20d54 TL |
102 | unsigned long __head __startup_64(unsigned long physaddr, |
103 | struct boot_params *bp) | |
c88d7150 | 104 | { |
6f9dd329 | 105 | unsigned long load_delta, *p; |
5868f365 | 106 | unsigned long pgtable_flags; |
c88d7150 | 107 | pgdval_t *pgd; |
032370b9 | 108 | p4dval_t *p4d; |
c88d7150 KS |
109 | pudval_t *pud; |
110 | pmdval_t *pmd, pmd_entry; | |
6f9dd329 | 111 | bool la57; |
c88d7150 | 112 | int i; |
187e91fe | 113 | unsigned int *next_pgt_ptr; |
c88d7150 | 114 | |
6f9dd329 | 115 | la57 = check_la57_support(physaddr); |
4c2b4058 | 116 | |
c88d7150 KS |
117 | /* Is the address too large? */ |
118 | if (physaddr >> MAX_PHYSMEM_BITS) | |
119 | for (;;); | |
120 | ||
121 | /* | |
122 | * Compute the delta between the address I am compiled to run at | |
123 | * and the address I am actually running at. | |
124 | */ | |
125 | load_delta = physaddr - (unsigned long)(_text - __START_KERNEL_map); | |
126 | ||
127 | /* Is the address not 2M aligned? */ | |
128 | if (load_delta & ~PMD_PAGE_MASK) | |
129 | for (;;); | |
130 | ||
5868f365 | 131 | /* Activate Secure Memory Encryption (SME) if supported and enabled */ |
aca20d54 | 132 | sme_enable(bp); |
5868f365 TL |
133 | |
134 | /* Include the SME encryption mask in the fixup value */ | |
135 | load_delta += sme_get_me_mask(); | |
136 | ||
c88d7150 KS |
137 | /* Fixup the physical addresses in the page table */ |
138 | ||
65ade2f8 | 139 | pgd = fixup_pointer(&early_top_pgt, physaddr); |
6f9dd329 KS |
140 | p = pgd + pgd_index(__START_KERNEL_map); |
141 | if (la57) | |
142 | *p = (unsigned long)level4_kernel_pgt; | |
143 | else | |
144 | *p = (unsigned long)level3_kernel_pgt; | |
145 | *p += _PAGE_TABLE_NOENC - __START_KERNEL_map + load_delta; | |
146 | ||
147 | if (la57) { | |
032370b9 KS |
148 | p4d = fixup_pointer(&level4_kernel_pgt, physaddr); |
149 | p4d[511] += load_delta; | |
150 | } | |
151 | ||
c88d7150 KS |
152 | pud = fixup_pointer(&level3_kernel_pgt, physaddr); |
153 | pud[510] += load_delta; | |
154 | pud[511] += load_delta; | |
155 | ||
156 | pmd = fixup_pointer(level2_fixmap_pgt, physaddr); | |
157 | pmd[506] += load_delta; | |
158 | ||
159 | /* | |
160 | * Set up the identity mapping for the switchover. These | |
161 | * entries should *NOT* have the global bit set! This also | |
162 | * creates a bunch of nonsense entries but that is fine -- | |
163 | * it avoids problems around wraparound. | |
164 | */ | |
165 | ||
187e91fe AP |
166 | next_pgt_ptr = fixup_pointer(&next_early_pgt, physaddr); |
167 | pud = fixup_pointer(early_dynamic_pgts[(*next_pgt_ptr)++], physaddr); | |
168 | pmd = fixup_pointer(early_dynamic_pgts[(*next_pgt_ptr)++], physaddr); | |
c88d7150 | 169 | |
21729f81 | 170 | pgtable_flags = _KERNPG_TABLE_NOENC + sme_get_me_mask(); |
c88d7150 | 171 | |
6f9dd329 | 172 | if (la57) { |
032370b9 KS |
173 | p4d = fixup_pointer(early_dynamic_pgts[next_early_pgt++], physaddr); |
174 | ||
175 | i = (physaddr >> PGDIR_SHIFT) % PTRS_PER_PGD; | |
5868f365 TL |
176 | pgd[i + 0] = (pgdval_t)p4d + pgtable_flags; |
177 | pgd[i + 1] = (pgdval_t)p4d + pgtable_flags; | |
032370b9 KS |
178 | |
179 | i = (physaddr >> P4D_SHIFT) % PTRS_PER_P4D; | |
5868f365 TL |
180 | p4d[i + 0] = (pgdval_t)pud + pgtable_flags; |
181 | p4d[i + 1] = (pgdval_t)pud + pgtable_flags; | |
032370b9 KS |
182 | } else { |
183 | i = (physaddr >> PGDIR_SHIFT) % PTRS_PER_PGD; | |
5868f365 TL |
184 | pgd[i + 0] = (pgdval_t)pud + pgtable_flags; |
185 | pgd[i + 1] = (pgdval_t)pud + pgtable_flags; | |
032370b9 | 186 | } |
c88d7150 KS |
187 | |
188 | i = (physaddr >> PUD_SHIFT) % PTRS_PER_PUD; | |
5868f365 TL |
189 | pud[i + 0] = (pudval_t)pmd + pgtable_flags; |
190 | pud[i + 1] = (pudval_t)pmd + pgtable_flags; | |
c88d7150 KS |
191 | |
192 | pmd_entry = __PAGE_KERNEL_LARGE_EXEC & ~_PAGE_GLOBAL; | |
5868f365 | 193 | pmd_entry += sme_get_me_mask(); |
c88d7150 KS |
194 | pmd_entry += physaddr; |
195 | ||
196 | for (i = 0; i < DIV_ROUND_UP(_end - _text, PMD_SIZE); i++) { | |
197 | int idx = i + (physaddr >> PMD_SHIFT) % PTRS_PER_PMD; | |
198 | pmd[idx] = pmd_entry + i * PMD_SIZE; | |
199 | } | |
200 | ||
201 | /* | |
202 | * Fixup the kernel text+data virtual addresses. Note that | |
203 | * we might write invalid pmds, when the kernel is relocated | |
204 | * cleanup_highmap() fixes this up along with the mappings | |
205 | * beyond _end. | |
206 | */ | |
207 | ||
208 | pmd = fixup_pointer(level2_kernel_pgt, physaddr); | |
209 | for (i = 0; i < PTRS_PER_PMD; i++) { | |
210 | if (pmd[i] & _PAGE_PRESENT) | |
211 | pmd[i] += load_delta; | |
212 | } | |
213 | ||
5868f365 TL |
214 | /* |
215 | * Fixup phys_base - remove the memory encryption mask to obtain | |
216 | * the true physical address. | |
217 | */ | |
4fa5662b | 218 | *fixup_long(&phys_base, physaddr) += load_delta - sme_get_me_mask(); |
5868f365 | 219 | |
107cd253 TL |
220 | /* Encrypt the kernel and related (if SME is active) */ |
221 | sme_encrypt_kernel(bp); | |
5868f365 TL |
222 | |
223 | /* | |
224 | * Return the SME encryption mask (if SME is active) to be used as a | |
225 | * modifier for the initial pgdir entry programmed into CR3. | |
226 | */ | |
227 | return sme_get_me_mask(); | |
228 | } | |
229 | ||
230 | unsigned long __startup_secondary_64(void) | |
231 | { | |
232 | /* | |
233 | * Return the SME encryption mask (if SME is active) to be used as a | |
234 | * modifier for the initial pgdir entry programmed into CR3. | |
235 | */ | |
236 | return sme_get_me_mask(); | |
c88d7150 KS |
237 | } |
238 | ||
8170e6be PA |
239 | /* Wipe all early page tables except for the kernel symbol map */ |
240 | static void __init reset_early_page_tables(void) | |
cfd243d4 | 241 | { |
65ade2f8 | 242 | memset(early_top_pgt, 0, sizeof(pgd_t)*(PTRS_PER_PGD-1)); |
8170e6be | 243 | next_early_pgt = 0; |
21729f81 | 244 | write_cr3(__sme_pa_nodebug(early_top_pgt)); |
8170e6be PA |
245 | } |
246 | ||
247 | /* Create a new PMD entry */ | |
b9d05200 | 248 | int __init __early_make_pgtable(unsigned long address, pmdval_t pmd) |
8170e6be PA |
249 | { |
250 | unsigned long physaddr = address - __PAGE_OFFSET; | |
8170e6be | 251 | pgdval_t pgd, *pgd_p; |
032370b9 | 252 | p4dval_t p4d, *p4d_p; |
6b9c75ac | 253 | pudval_t pud, *pud_p; |
b9d05200 | 254 | pmdval_t *pmd_p; |
8170e6be PA |
255 | |
256 | /* Invalid address or early pgt is done ? */ | |
65ade2f8 | 257 | if (physaddr >= MAXMEM || read_cr3_pa() != __pa_nodebug(early_top_pgt)) |
8170e6be PA |
258 | return -1; |
259 | ||
6b9c75ac | 260 | again: |
65ade2f8 | 261 | pgd_p = &early_top_pgt[pgd_index(address)].pgd; |
8170e6be PA |
262 | pgd = *pgd_p; |
263 | ||
264 | /* | |
265 | * The use of __START_KERNEL_map rather than __PAGE_OFFSET here is | |
266 | * critical -- __PAGE_OFFSET would point us back into the dynamic | |
267 | * range and we might end up looping forever... | |
268 | */ | |
6f9dd329 | 269 | if (!pgtable_l5_enabled) |
032370b9 KS |
270 | p4d_p = pgd_p; |
271 | else if (pgd) | |
272 | p4d_p = (p4dval_t *)((pgd & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); | |
273 | else { | |
274 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
275 | reset_early_page_tables(); | |
276 | goto again; | |
277 | } | |
278 | ||
279 | p4d_p = (p4dval_t *)early_dynamic_pgts[next_early_pgt++]; | |
280 | memset(p4d_p, 0, sizeof(*p4d_p) * PTRS_PER_P4D); | |
281 | *pgd_p = (pgdval_t)p4d_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; | |
282 | } | |
283 | p4d_p += p4d_index(address); | |
284 | p4d = *p4d_p; | |
285 | ||
286 | if (p4d) | |
287 | pud_p = (pudval_t *)((p4d & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); | |
6b9c75ac YL |
288 | else { |
289 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
8170e6be | 290 | reset_early_page_tables(); |
6b9c75ac YL |
291 | goto again; |
292 | } | |
8170e6be PA |
293 | |
294 | pud_p = (pudval_t *)early_dynamic_pgts[next_early_pgt++]; | |
a91bbe01 | 295 | memset(pud_p, 0, sizeof(*pud_p) * PTRS_PER_PUD); |
032370b9 | 296 | *p4d_p = (p4dval_t)pud_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; |
8170e6be | 297 | } |
6b9c75ac YL |
298 | pud_p += pud_index(address); |
299 | pud = *pud_p; | |
8170e6be | 300 | |
6b9c75ac YL |
301 | if (pud) |
302 | pmd_p = (pmdval_t *)((pud & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); | |
303 | else { | |
304 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
305 | reset_early_page_tables(); | |
306 | goto again; | |
307 | } | |
308 | ||
309 | pmd_p = (pmdval_t *)early_dynamic_pgts[next_early_pgt++]; | |
a91bbe01 | 310 | memset(pmd_p, 0, sizeof(*pmd_p) * PTRS_PER_PMD); |
6b9c75ac YL |
311 | *pud_p = (pudval_t)pmd_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; |
312 | } | |
6b9c75ac | 313 | pmd_p[pmd_index(address)] = pmd; |
8170e6be PA |
314 | |
315 | return 0; | |
cfd243d4 VG |
316 | } |
317 | ||
b9d05200 TL |
318 | int __init early_make_pgtable(unsigned long address) |
319 | { | |
320 | unsigned long physaddr = address - __PAGE_OFFSET; | |
321 | pmdval_t pmd; | |
322 | ||
323 | pmd = (physaddr & PMD_MASK) + early_pmd_flags; | |
324 | ||
325 | return __early_make_pgtable(address, pmd); | |
326 | } | |
327 | ||
1da177e4 LT |
328 | /* Don't add a printk in there. printk relies on the PDA which is not initialized |
329 | yet. */ | |
330 | static void __init clear_bss(void) | |
331 | { | |
1da177e4 | 332 | memset(__bss_start, 0, |
2bc0414e | 333 | (unsigned long) __bss_stop - (unsigned long) __bss_start); |
1da177e4 LT |
334 | } |
335 | ||
f1da834c YL |
336 | static unsigned long get_cmd_line_ptr(void) |
337 | { | |
338 | unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; | |
339 | ||
ee92d815 YL |
340 | cmd_line_ptr |= (u64)boot_params.ext_cmd_line_ptr << 32; |
341 | ||
f1da834c YL |
342 | return cmd_line_ptr; |
343 | } | |
344 | ||
1da177e4 LT |
345 | static void __init copy_bootdata(char *real_mode_data) |
346 | { | |
1da177e4 | 347 | char * command_line; |
f1da834c | 348 | unsigned long cmd_line_ptr; |
1da177e4 | 349 | |
b9d05200 TL |
350 | /* |
351 | * If SME is active, this will create decrypted mappings of the | |
352 | * boot data in advance of the copy operations. | |
353 | */ | |
354 | sme_map_bootdata(real_mode_data); | |
355 | ||
30c82645 | 356 | memcpy(&boot_params, real_mode_data, sizeof boot_params); |
5dcd14ec | 357 | sanitize_boot_params(&boot_params); |
f1da834c YL |
358 | cmd_line_ptr = get_cmd_line_ptr(); |
359 | if (cmd_line_ptr) { | |
360 | command_line = __va(cmd_line_ptr); | |
30c82645 | 361 | memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); |
1da177e4 | 362 | } |
b9d05200 TL |
363 | |
364 | /* | |
365 | * The old boot data is no longer needed and won't be reserved, | |
366 | * freeing up that memory for use by the system. If SME is active, | |
367 | * we need to remove the mappings that were created so that the | |
368 | * memory doesn't remain mapped as decrypted. | |
369 | */ | |
370 | sme_unmap_bootdata(real_mode_data); | |
1da177e4 LT |
371 | } |
372 | ||
2605fc21 | 373 | asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data) |
1da177e4 | 374 | { |
b4e0409a IM |
375 | /* |
376 | * Build-time sanity checks on the kernel image and module | |
377 | * area mappings. (these are purely build-time and produce no code) | |
378 | */ | |
8e3c2a8c BP |
379 | BUILD_BUG_ON(MODULES_VADDR < __START_KERNEL_map); |
380 | BUILD_BUG_ON(MODULES_VADDR - __START_KERNEL_map < KERNEL_IMAGE_SIZE); | |
b4e0409a | 381 | BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE); |
8e3c2a8c | 382 | BUILD_BUG_ON((__START_KERNEL_map & ~PMD_MASK) != 0); |
b4e0409a IM |
383 | BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0); |
384 | BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL)); | |
c65e774f | 385 | MAYBE_BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) == |
b4e0409a | 386 | (__START_KERNEL & PGDIR_MASK))); |
66d4bdf2 | 387 | BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END); |
b4e0409a | 388 | |
1e02ce4c AL |
389 | cr4_init_shadow(); |
390 | ||
8170e6be PA |
391 | /* Kill off the identity-map trampoline */ |
392 | reset_early_page_tables(); | |
393 | ||
3df0af0e YL |
394 | clear_bss(); |
395 | ||
65ade2f8 | 396 | clear_page(init_top_pgt); |
d0f77d4d | 397 | |
21729f81 TL |
398 | /* |
399 | * SME support may update early_pmd_flags to include the memory | |
400 | * encryption mask, so it needs to be called before anything | |
401 | * that may generate a page fault. | |
402 | */ | |
403 | sme_early_init(); | |
404 | ||
5d5aa3cf AP |
405 | kasan_early_init(); |
406 | ||
588787fd | 407 | idt_setup_early_handler(); |
f6c2e333 | 408 | |
fa2bbce9 YL |
409 | copy_bootdata(__va(real_mode_data)); |
410 | ||
feddc9de FY |
411 | /* |
412 | * Load microcode early on BSP. | |
413 | */ | |
414 | load_ucode_bsp(); | |
415 | ||
65ade2f8 KS |
416 | /* set init_top_pgt kernel high mapping*/ |
417 | init_top_pgt[511] = early_top_pgt[511]; | |
8170e6be | 418 | |
f97013fd JF |
419 | x86_64_start_reservations(real_mode_data); |
420 | } | |
421 | ||
422 | void __init x86_64_start_reservations(char *real_mode_data) | |
423 | { | |
fa2bbce9 YL |
424 | /* version is always not zero if it is copied */ |
425 | if (!boot_params.hdr.version) | |
426 | copy_bootdata(__va(real_mode_data)); | |
9de819fe | 427 | |
8d152e7a | 428 | x86_early_init_platform_quirks(); |
75175278 | 429 | |
3fda5bb4 AS |
430 | switch (boot_params.hdr.hardware_subarch) { |
431 | case X86_SUBARCH_INTEL_MID: | |
432 | x86_intel_mid_early_setup(); | |
433 | break; | |
434 | default: | |
435 | break; | |
436 | } | |
437 | ||
1da177e4 LT |
438 | start_kernel(); |
439 | } |